<template>
  <el-container class="home-container">
    <!-- 头部 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="" srcset="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体 -->
    <el-container>
      <!-- 左侧边栏 -->
      <el-aside v-bind:width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 菜单 -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409eff"
          :unique-opened="true"
          :collapse="isCollapse"
          :collapse-transition="false"
          :router="true"
          :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu v-bind:index=" item.id + '' " v-for="item in menulist" :key="item.id">
            <!-- 一级菜单的模板 -->
            <template slot="title">
              <!-- 图标 -->
              <i v-bind:class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item v-bind:index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path)">
              <!-- 二级菜单的模板 -->
              <template slot="title">
                <i class="el-icon-menu"></i>
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容 -->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menulist: [],
      // 图标
      iconsObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠菜单
      isCollapse: false,
      // 激活菜单的路径
      activePath: ''
    }
  },
  // 实例完成创建
  created () {
    // 发起请求获取左侧菜单列表数据
    this.getMenuList()
    // 获取激活菜单的链接地址
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    // 退出登录
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取左侧菜单数据
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      // this.$message.success(res.meta.msg)
      // 将获取到的菜单数据保存到 menulist 中
      this.menulist = res.data
      // console.log(res)
    },
    // 点击按钮切换菜单的折叠于展开
    toggleCollapse() {
      // 切换折叠状态
      this.isCollapse = !this.isCollapse
    },
    // 保存激活菜单的路径
    saveNavState(activePath) {
      // 将当前激活的二级菜单路由地址保存到 sessionStorage 中
      window.sessionStorage.setItem('activePath', activePath)
      // 修改激活菜单链接地址值
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-left: 0;
  color: #fff;
  font-size: 20px;
  div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu{
    border-right: 0px;
  }
}
.el-main {
  background-color: #eaedf1;
}
.home-container {
  height: 100%;
}
.iconfont{
  margin-right: 10px;
}
.toggle-button{
  background-color: #4a5064;
  line-height: 24px;
  font-size: 10px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
